[sdiy] Looking for 2164 12db/oct slopes bandpass filter design.. more detailed..

[Jean-Pierre Desrochers]

Tom,

> Olivier's designs on the Mutable Instruments site are still a good
starting point.
>  His Dual SVF Shruthi board would do what you want - you could use the 12
dB LP from one filter in concert 
> with the 12dB HP from the other.

I cannot find any 12db Highpass design using 2164 in both links you gave
me..
Sorry..

JP

-----Message d'origine-----
De : Tom Wiltshire [mailto:tom at electricdruid.net] 
Envoyé : 8 mars 2014 14:51
À : Jean-Pierre Desrochers
Cc : synth-diy at dropmix.xs4all.nl
Objet : Re: [sdiy] Looking for 2164 12db/oct slopes bandpass filter design..
more detailed..

Olivier's designs on the Mutable Instruments site are still a good starting
point. His Dual SVF Shruthi board would do what you want - you could use the
12 dB LP from one filter in concert with the 12dB HP from the other.

http://mutable-instruments.net/shruthi1/build/svf
http://mutable-instruments.net/static/schematics/Shruthi-Analog-SVF-v02.pdf

HTH,
Tom


On 8 Mar 2014, at 16:46, Jean-Pierre Desrochers <jpdesroc at oricom.ca> wrote:

> In fact I should have been clearer on my needs..
> I'm looking for a 2164 based  bandpass filter design Built with one 
> separate 2 poles lowpass (12db/oct) (2164 section #1+2) In series with 
> one separate 2 poles highpass (12db/oct) (2164 section #3+4).
> These 2 blocks in series  make it possible to feed 2 separate & 
> different cutoff CV's Thus having the possibility to open or close a 
> 'gap' between the cutoffs Creating a variable bandwidth for the 
> overall bandpass filter CV controlled.
> That's why I cannot use a 'derivated' bandpass from a lowpass design 
> using pole mixing because the cuttof freq would be the same All around 
> the 2164 blocks..
> I'm only looking for schematics of:
> -2 poles 2164 based lowpass filter (12db/oct slope)
> -2 poles 2164 based highpass filter (12db/oct slope)
> 
> Your ideas are welcomed.
> J-Pierre
> 
> 
> -----Message d'origine-----
> De : synth-diy-bounces at dropmix.xs4all.nl
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] De la part de Jean-Pierre 
> Desrochers Envoyé : 7 mars 2014 11:34 À : synth-diy at dropmix.xs4all.nl 
> Objet : [sdiy] Looking for 2164 12db/oct bandpass filter design..
> 
> Looking for 2164 based 12db/oct bandpass filter design..
> 
> Any web link ?
> 
> Thanks
> JP
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